feat(meta): 平衡页签可编辑 aether_thresholds（保存不丢字段）

addons/game_designer/balance_tab.gd

@@ -12,6 +12,7 @@ var _data: Dictionary = {}
 var _mult_spins: Dictionary = {}   # key → [SpinBox ×3]
 var _miniboss: SpinBox
 var _boss: SpinBox
+var _aether: TextEdit
 var _status: Label
 
 func _ready() -> void:
@@ -45,6 +46,10 @@ func _ready() -> void:
 	_boss = UI.spin(1, 999999, 10, float(bhp.get("5", 1800)))
 	h2.add_child(_boss)
 	add_child(HSeparator.new())
+	var al := Label.new(); al.text = "碎片奖励阈值 aether_thresholds（JSON [[波次,碎片],...]）"; add_child(al)
+	_aether = TextEdit.new(); _aether.custom_minimum_size = Vector2(0, 50)
+	_aether.text = JSON.stringify(_data.get("aether_thresholds", [[1, 0], [5, 3], [10, 8], [15, 14], [20, 20]]))
+	add_child(_aether)
 	add_child(UI.btn("💾 保存 balance.json", _save))
 	_status = UI.status_label(); add_child(_status)
 
@@ -57,9 +62,13 @@ func _save() -> void:
 	for key in MULT_KEYS:
 		var spins: Array = _mult_spins[key]
 		mults[key] = [spins[0].value, spins[1].value, spins[2].value]
+	var thresholds = JSON.parse_string(_aether.text) if _aether.text.strip_edges() != "" else []
+	if not (thresholds is Array):
+		thresholds = []
 	var out := {
 		"difficulty_mults": mults,
 		"boss_hp": {"4": _miniboss.value, "5": _boss.value},
+		"aether_thresholds": thresholds,
 	}
 	if UI.save_json(PATH, out):
 		UI.set_status(_status, "💾 已保存（重启 F5 生效）")